<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>省市的二级联动</title>
		<style>
			#province{
				color: red;
				font-size: 20px;
			}
			#city{
				color: red;
				font-size: 20px;
			}
		</style>
	</head>
<select id="province" >
        <option  value="-1" >省份</option>
    </select>
    <select id="city" >
        <option  value="-1">城市</option>
    </select>
    <script src="3-7.js" ></script>
</body>

</html>
